Computer Science - Digital Computer Electronics MCQs Part 2

1. If a microcomputer has a 64K memory, what are the hexadecimal notations for the first and last memory location?

A.
0000, EEEE

B.
0, 64

C.
0000, FFFF

D.
0000, 9999

E.
None of the above

 Answer Option C

2. A microprocessor has memory locations from 0000 to 3FFF. Each memory location stores 1 byte. How bytes can the memory store? Express this in kilobytes?

A.
4,095, 4K

B.
16,384, 16K

C.
32,740, 32K

D.
46,040, 46K

E.
None of the above

 Answer Option B

3. The m-bit parallel adder consists of:

A.
(m+1) full adders

B.
m/2 full adders

C.
m-1 full adders

D.
m full adders

E.
None of the above

 Answer Option D

4. An OR gate has 6 inputs. How many input words are in its truth table?

A.
64

B.
32

C.
16

D.
128

E.
None of the above

 Answer Option A

5. Which TTL sub-family has maximum speed?

A.
standard TTL

B.
schottky-clamped TTL

C.
high speed TTL

D.
low power TTL

E.
None of the above

 Answer Option B

6. Conversion of binary number 1100012 to its decimal number is

A. 2710

B. 4910

C. 3910

D. 5010

E. None of the above

 Answer Option B

7. The OR gate has two or more input signals. If any input is _____ the output is high.

A. low

B. high

C. 0

D. All of the above

E. None of the above

 Answer Option B

8. How many memory locations can 14 address bits access?

A. 16,384

B. 8,192

C. 4096

D. 14

E. None of the above

 Answer Option A

9. The ASCII code is a 7-bit code for

A. letters

B. numbers

C. other symbols

D. All of the above

E. None of the above

 Answer Option D

10. The EXCLUSIVE - NOR gate is equivalent to an _____ gate followed by an invertor.

A. OR

B. AND

C. NAND

D. XOR

E. None of the above

 Answer Option D

11. The 2's compliment of binary number 010111.1100 is

A. 101001.1100

B. 101000.0100

C. 010111.0011

D. 101000.0011

E. None of the above

 Answer Option B

12. In boolean algebra, the times sign stands for the _____ operation

A. AND

B. OR

C. NAND

D. NOR

E. None of the above

 Answer Option A

13. What logic function is obtained by adding an inverter to the output of an AND gate?

A. OR

B. NAND

C. XOR

D. NOR

E. None of the above

 Answer Option B

14. Conversion of an octal number 74328 to a binary number is

A. 11110001101112

B. 1111000110102

C. 1100110101112

D. 1111111110002

E. None of the above

 Answer Option B

15. Conversion of an octal number 1438 to hexadecimal number is

A. 6316

B. 6016

C. 5016

D. 5716

E. None of the above

 Answer Option A

16. The memory cell of a dynamic RAM is simpler and smaller than the memory cell of a _____ RAM.

A. volatile

B. static

C. semiconductor

D. bipolar

E. None of the above

 Answer Option B

17. A byte is consist of _____ bits

A. two

B. four

C. eight

D. ten

E. None of the above

 Answer Option C

18. What is the 1's complement of 0000 1111 0010 1101 number?

A. 1111 0000 0010 1101

B. 1111 0000 1101 0010

C. 1111 1100 1010 1100

D. 1001 0010 1010 1100

E. None of the above

 Answer Option B

19. Addition of 11012 and 10102 is

A. 101012

B. 110002

C. 110112

D. 101112

E. None of the above

 Answer Option D

20. A NAND gate is equivalent to an AND gate followed by an inverter. All inputs must be _____ to get a low output

A. low

B. high

C. some low and some high

D. 0's

E. None of the above

 Answer Option B

21. What logic function is produced by adding an inverter to the output of an AND gate?

A. NAND

B. NOR

C. XOR

D. OR

E. None of the above

 Answer Option A

22. Conversion of decimal number 2810 to it's octal number equivalent is

A. 328

B. 408

C. 348

D. 368

E. None of the above

 Answer Option C

23. Division of 1000112 by 1012 is

A. 1002

B. 1112

C. 1012

D. 10102

E. None of the above

 Answer Option B

24. The NOR gate is logically equivalent to an OR gate followed by an _____

A. AND

B. XAND

C. XOR

D. inverter

E. None of the above

 Answer Option D

25. The dynamic race hazard problem occurs in

A. combinational circuits only

B. sequential circuits only

C. both combinational and sequential circuits

D. none of the combinational and sequential circuits

E. None of the above

 Answer Option D

26. Resistor Ratio design is used in linear ICs because

A. Ratios increase input resistance

B. Ratios increase amplifier gain

C. Precise resistor values are not possible with IC processes

D. All of the above

E. None of the above

 Answer Option C

27. What advantages do ICs have over discrete-device circuits due to their greater complexity (i.e. more circuitary in less area)

A. Smaller size

B. Higher reliability

C. Lower cost

D. All of the above

E. None of the above

 Answer Option D

28. Conversion of an octal number 1368 to hexadecimal number is

A. 7E16

B. 5E16

C. 5A16

D. 5D16

E. None of the above

 Answer Option B

29. The control and arithmetic-logic sections are called the _____

A. Block diagram

B. Control Unit

C. Input / Output Unit

D. Central Processing Unit

E. None of the above

 Answer Option D

30. How many full adders are required to construct an m- bit parallel adder?

A. m/2

B. m-1

C. m

D. m+1

E. None of the above

 Answer Option C

31. The number of binary bits required to represent a hexadecimal digit is

A. 3

B. 4

C. 6

D. 8

E. None of the above

 Answer Option B

32. Instead of counting with binary numbers, a ring counter uses words that have a single high _____

A. bytes

B. bit

C. gate

D. chip

E. None of the above

 Answer Option B

33. Multiplication of 1112 by 1012 is

A. 1100112

B. 1000112

C. 1111002

D. 0001012

E. None of the above

 Answer Option B

34. For what logic gate the outputs in complement of the input?

A. NOT

B. AND

C. OR

D. XOR

E. None of the above

 Answer Option A

35. What is the decimal equivalent of 210?

A. 4096

B. 1024

C. 1000

D. 16

E. None of the above

 Answer Option B

36. The maximum number of TTL loads that a TTL device can drive reliably over the specified temperature range is

A. fanout

B. bipolar

C. chip

D. universal logic circuit

E. None of the above

 Answer Option A

37. Conversion of hexadecimal number 6B216 to it's binary number equivalent is

A. 11110001101112

B. 0110101100102

C. 01100110011112

D. 111111112

E. None of the above

 Answer Option B

38. The output of the following gate is 0 only if at least one of the inputs is 1:

A. AND gate

B. OR gate

C. EX-OR gate

D. NOR gate

E. None of the above

 Answer Option D

39. In which of the following adder circuits, the carry look ripple delay is eliminated?

A. Half adder

B. Full adder

C. Parallel adder

D. Carry-look-ahead adder

E. None of the above

 Answer Option D

40. With positive clocking the clock signal must be _____ for the flip-flop to respond.

A. high

B. low

C. set

D. race

E. None of the above

 Answer Option A

41. Conversion of binary number 10100002 to an octal number is

A. 1198

B. 1018

C. 1118

D. 1208

E. None of the above

 Answer Option D

42. Conversion of an octal number 478 to its binary number is

A. 1100112

B. 1001112

C. 1100112

D. 11110112

E. None of the above

 Answer Option B

43. A _____ is a group of devices that store digital data.

A. circuits

B. register

C. variations

D. bit

E. None of the above

 Answer Option B

44. Conversion of an octal number 31378 to it's decimal equivalent is

A. 163110

B. 163210

C. 153110

D. 193110

E. None of the above

 Answer Option A

45. Semiconductor memory is:

A. somewhat slower than magnetic core memory

B. a volatile memory

C. somewhat larger than the magnetic core memory

D. All of the above

E. None of the above

 Answer Option B

46. Conversion of an octal number 1108 to its decimal number is

A. 7010

B. 7210

C. 7310

D. 11010

E. None of the above

 Answer Option B

47. Computer ICs work reliably because they are based on _____ design.

A. Top-bottom

B. System

C. Two-stage

D. Two-states

E. None of the above

 Answer Option D

48. The maximum count which a 6-bit binary word can represent is

A. 36

B. 64

C. 63

D. 65

E. None of the above

 Answer Option C

49. A half-adder is also known as:

A. AND circuit

B. NAND circuit

C. NOR circuit

D. EX-OR circuit

E. None of the above

 Answer Option D

50. Why are digital circuits easier to design than analog circuits?

A. they do not control electricity precisely over a wide range

B. they are made in the form of ICs

C. all elements of digital circuit are from the same family

D. they are smaller in size

E. None of the above

 Answer Option A